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Documents Solution: Mixer output noise with ADL5802 Demo Board - varying Supply Current
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  • +Documents
  • 'Must Knows' about ADI's family of Hittite PLL+VCO and Clock Timing products
  • AD8318 Temperature sensor output characteristic
  • AD8345 Pout vs. Vinbb Transfer Function
  • AD8361 Output Offset Voltage
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  • ADC Noise Figure in ADIsimRF
  • ADF4107: Phase noise
  • ADF4150, ADF4150HV, and ADF4151 evaluation board control software source code
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  • ADF4155 evaluation board control software
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  • Calculating VSWR using dual Linear-in-dB RMS Detecto
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  • connecting output of AD9854 DDS to ADL5375-05 modulator
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  • Explain how the ADF41XX datasheet PLL noise is specified?
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  • FAQ: 1/f Noise for the ADL5387, ADL5382, and ADL5380
  • FAQ: AD8302 Gain and Phase with no Input Signal
  • FAQ: AD8302 Gain/Phase Detector, Response to Modulated Signals
  • FAQ: AD8302 Gain/Phase Detector: Operation as a Frequency Discriminator
  • FAQ: AD8309 Limiter impedance
  • FAQ: AD8309 Limiter output swing
  • FAQ: AD8340, AD8341, and ADL5390 Vector Modulators: IBBP, IBBM, QBBP, and QBBM Input Impedance to Ground
  • FAQ: AD8348 and ADL5387 maintains performance at low frequencies
  • FAQ: AD8362 RMS Detector: Equations for RMS Averaging Capacitor and Corner Frequency of Offset Control Loop
  • FAQ: AD8370 dc coupled with dual supplies
  • FAQ: ADF4153 DLD ( Digital Lock Detect )
  • FAQ: ADL5380 Performance below 400 MHz.
  • FAQ: ADL5511 No Connect (NC) Pins
  • FAQ: ADL5801 Low Frequency Operation
  • FAQ: ADL5801 Mixer Performance when driven single-ended on both its RF and LO ports
  • FAQ: ADL5802 Low Frequency Operation
  • FAQ: ADL5902 Part-to-Part Supply Current Variation
  • FAQ: ADL5902 RMS Detector Output Voltage Clamping for High Input Power Levels
  • FAQ: ADL5902 RMS Detector: Operation at Frequencies greater than 5.8 GHz
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  • FAQ: Alternatives to  AD8362 High Range RF RMS Detector
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  • FAQ: Baseband Bandwidth of ADL5375 Broadband IQ Modulator
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  • FAQ: OP-AMP choice for active PLL loop filters
  • FAQ: Operating RMS Detectors at Low Frequencies
  • FAQ: Operating the AD8362 Evaluation Board at Low Frequencies
  • FAQ: Operating the AD8364 dual RMS Detector at frequencies below 450 MHz
  • FAQ: Operation of AD8375 and AD8376 Digitally Controlled VGAs at Low Frequency
  • FAQ: PLL Normalized phase noise floor and 1/f phase noise
  • FAQ: Reducing the Response Time of an RMS Detector
  • FAQ: RF Connectors used on ADI Evaluation Boards
  • FAQ: RF Detector Recommendations
  • FAQ: S-Parameters
  • FAQ: The ADL5240_ADL5243 DSA control interface voltage thresholds and Byte(8 bits) opeation
  • FAQ: The Ultimate Guide to the ADF5355 Microwave Wideband Synthesizer
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  • Solution: Mixer output noise with ADL5802 Demo Board - varying Supply Current
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Solution: Mixer output noise with ADL5802 Demo Board - varying Supply Current

Solution: Mixer output noise with ADL5802 Demo Board - varying Supply Current by Jan_V

We found a problem with our ADL5802 Demo Board,  showing high levels of output noise on Mixer output. This board was purchased direct from AD.  We also noticed fluctuating Bias Current from 130mA to 150mA with Vset=2V  and raised Case #: 2E15LU04568. 

Subsequently we found that flexing the board and pressing down the ADL5802 chip seems to indicate a hardware problem with the board with poor connection or soldering joint suspected. 

Solution:  As the demo board was no longer in warranty, we resoldered all components on the board.

We then found there was no connection between the VPOS board pin and chip pins that should see supply voltage.

As the supply lines run on inner layers which are not documented by AD, we soldered a wire from the board pin to one of the points where we knew the supply voltage should go. Now, the mixer current is back and rock stable at 160mA for Vset=2V. Also the mixer output level is now constant. No more flexing or pressure sensitivity.
We believe the issue was caused by an poor connection in one of the inner layer tracks on the ADL5802 Demo board.
This information is posted for the benefit of other users of this board.

a)  Mixer Output noise as found on first use at 100 MHz Mixer Output.  Note Y scale is 0.01 dB/Div is correct. 
Ref1  indication is with attenuation applied.

The RF source at 100MHz delivers a ‐13dBm sinewave signal to the mixer RF1 input port.

The LO source at 110.7MHz delivers a 2dBm rectangle signal to the mixer LO port.

Mixer output is at 10.7 MHz.
Screenshots taken with DG8SAQ Vector Network Analyzer.




b) Mixer output noise as found after repair of the ADL5802 Demo board.

Mixer output is clean  and Current consumption is rock steady at 160mA

Again note Y scale resolution 0.01 dB

 


 

This information is posted for the benefit of other users of this board.

 

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